US10260410B2 - Variable compression ratio device and control method thereof - Google Patents
Variable compression ratio device and control method thereof Download PDFInfo
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- US10260410B2 US10260410B2 US15/829,621 US201715829621A US10260410B2 US 10260410 B2 US10260410 B2 US 10260410B2 US 201715829621 A US201715829621 A US 201715829621A US 10260410 B2 US10260410 B2 US 10260410B2
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- compression ratio
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- eccentric cam
- chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/04—Engines with variable distances between pistons at top dead-centre positions and cylinder heads
- F02B75/045—Engines with variable distances between pistons at top dead-centre positions and cylinder heads by means of a variable connecting rod length
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D15/00—Varying compression ratio
- F02D15/02—Varying compression ratio by alteration or displacement of piston stroke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/009—Electrical control of supply of combustible mixture or its constituents using means for generating position or synchronisation signals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/14—Introducing closed-loop corrections
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C3/00—Shafts; Axles; Cranks; Eccentrics
- F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
- F16C3/06—Crankshafts
- F16C3/14—Features relating to lubrication
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C7/00—Connecting-rods or like links pivoted at both ends; Construction of connecting-rod heads
- F16C7/06—Adjustable connecting-rods
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/06—Testing internal-combustion engines by monitoring positions of pistons or cranks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/12—Characterised by the construction of the motor unit of the oscillating-vane or curved-cylinder type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/22—Internal combustion engines
Definitions
- the present disclosure relates generally to variable compression ratio devices and, more particularly, to a variable compression ratio device for continuously varying a compression ratio within a combustion chamber of an internal combustion engine according to operating conditions of an engine to enhance fuel efficiency and power, and a control method thereof.
- VCR variable compression ratio
- a diesel engine implements low temperature combustion by reducing a compression ratio of a piston combustion chamber. Since cold-start performance is degraded in response to a reduction in compression ratio, a combustion chamber preheating device is required.
- the VCR device is equipped in a component which rotates or reciprocates to move, such as a piston, a connecting rod, a crank shaft, or the like.
- a VCR device with a complex structure or an increase in weight may suffer from degraded efficiency.
- a typical example of the recently developed VCR device is a device in which an eccentric cam is disposed between a piston pin and a connecting rod. A piston is lifted or lowered by rotating the eccentric cam through a hydraulic fluid (or oil) to vary a compression ratio.
- variable compression ratio device that senses a compression ratio of a combustion chamber according to operating conditions of the engine and causes the sensed compression ratio to reach a target compression ratio.
- the variable compression ratio device has advantages of reducing fuel consumption and enhancing power.
- a variable compression ratio device includes: a connecting rod connected to a piston disposed in a cylinder through a piston pin; an eccentric cam interposed between the piston pin and the connecting rod, the eccentric cam moving the piston up and down to vary a compression ratio according to a rotation position of the eccentric cam; a hydraulic controller controlling hydraulic fluid supplied to each of first and second chambers formed between the eccentric cam and the connecting rod, the first chamber rotating the eccentric cam in one direction by supplied hydraulic fluid, and the second chamber rotating the eccentric cam in another direction by the supplied hydraulic fluid; a position sensor sensing a position of the piston; and a compression ratio controller calculating a target compression ratio according to an operating condition of an engine, calculating a current compression ratio based on the piston using a signal sensed by the position sensor, and controlling the rotation position of the eccentric cam through an oil control valve to cause the current compression ratio to reach the target compression ratio.
- the compression ratio controller varies the rotation position of the eccentric cam according to a difference between the calculated target compression ratio and the calculated current compression ratio.
- variable compression ratio device may further include: a crank pin of a crank shaft connected to an end of the connecting rod; and a crank angle sensor sensing a rotation position of the crank shaft.
- the position sensor may include a first sensor element fixed to a side of the piston; and a second sensor element mounted on the engine and configured to sense a position of the first sensor element.
- the second sensor element may be disposed in a region in which the first sensor element descends and ascends in correspondence with a movement of the piston.
- the first sensor element may be disposed in a position higher than a bottom dead center (BDC) of the second sensor element by a preset distance.
- BDC bottom dead center
- the compression ratio controller may calculate: i) a first crank angle at a point at which the second sensor senses the first sensor when the first sensor element descends, ii) a second crank angle at a point at which the second sensor element senses the first sensor element when the first sensor element, which has descended, ascends, and iii) the current compression ratio as according to a difference between the first crank angle and the second crank angle.
- the compression ratio controller may calculate the target compression ratio based on a rotation speed of the crank shaft and a target injection amount of fuel.
- the connecting rod may have a first chamber connection passage connected to the first chamber and a second chamber connection passage connected to the second chamber.
- a recess to which a hydraulic fluid is supplied may be provided on a side of an outer circumferential surface of the eccentric cam, and a protrusion dividing the recess into the first chamber and the second chamber may be provided on an inner circumferential surface of the connecting rod.
- a sealing member sliding to a bottom surface of the recess and sealing the first chamber and the second chamber from each other may be disposed at a front end of the protrusion.
- the hydraulic controller may include: a spool valve supplying a hydraulic fluid to the first chamber or the second chamber; an oil control valve controlling the spool valve; and an oil pump pumping hydraulic fluid to the oil control valve.
- the first sensor element may include a magnetic component, and the second sensor element may sense magnetism.
- a method for controlling a variable compression ratio device includes: sensing, by a position sensor, a position signal of a piston; calculating, by a compression ratio controller, a current compression ratio using the position signal of the piston; calculating, by the compression ratio controller, a target compression ratio according to an operating condition of an engine; calculating, by the compression ratio controller, a difference between the calculated current compression ratio and the calculated target compression ratio; and controlling, by the compression ratio controller, a compression ratio of the piston according to the calculated difference to cause the current compression ratio to reach the target compression ratio.
- the calculating of the current compression ratio may include: calculating, by the compression ratio controller, a duration value between a first point at which the piston descends and a second point at which the piston, which has descended, ascends, and calculating, by the compression ratio controller, the current compression ratio so as to correspond to the duration value.
- the first point and the second point may be first and second crank angles, respectively, of the crank shaft, and the duration value is a difference of the first and second crank angles.
- the target compression ratio may be calculated based on at least one of an RPM of the engine, an injection amount of fuel, and an operation load.
- the method may further include: maintaining, by the compression ratio controller, the current compression ratio when an absolute value of a difference between the current compression ratio and the target compression ratio does not deviate from the set value; and changing, by the compression ratio controller, the current compression ratio so as to correspond to the target compression ratio when the absolute value of the difference value deviates from the set value.
- a variable compression ratio device includes: a piston disposed in a cylinder; and a position sensor sensing a position of the piston.
- the position sensor may include: a first sensor element fixed to a side of the piston; and a second sensor element mounted to an engine and configured to sense a position of the first sensor element.
- the second sensor element may be disposed in a region in which the first sensor element descends and ascends in correspondence with a movement of the piston.
- variable compression ratio device may easily calculate a current compression ratio based on the piston using the position sensor sensing a position of the piston. Also, a target compression ratio selected according to operating conditions of the engine and a calculated current compression ratio may be compared and the current compression ratio may be controlled to reach the target compression ratio. Thus, since combustion efficiency is enhanced by precisely controlling a compression ratio under a low load condition and a high load condition of the engine, fuel consumption may be positively reduced according to the operating conditions.
- FIG. 1 is a block diagram schematically illustrating a configuration of a variable compression ratio device according to embodiments of the present disclosure.
- FIG. 2 is a graph illustrating a relation between compression ratio and heat efficiency according to embodiments of the present disclosure.
- FIG. 3 is a graph illustrating relation among compression ratio, a revolution per minute (RPM) of an engine, and engine torque according to embodiments of the present disclosure.
- RPM revolution per minute
- FIG. 4 is a view schematically illustrating flow of a hydraulic fluid in a variable compression ratio device according to embodiments of the present disclosure.
- FIG. 5 is a partial cross-sectional view illustrating a variable compression ratio device according to embodiments of the present disclosure.
- FIG. 6 is a view schematically illustrating behaviors of a piston according to compression ratios in a variable compression ratio device according to embodiments of the present disclosure.
- FIG. 7 is a graph illustrating behaviors of a piston and crank angle according to compression ratios in a variable compression ratio device according to embodiments of the present disclosure.
- FIG. 8 is a table illustrating crank angles at which a first sensor element is sensed according to compression ratios of FIG. 7 .
- FIG. 9 is a graph illustrating behaviors of a piston and torque applied to an eccentric camp according to crank angles in a variable compression ratio device according to embodiments of the present disclosure.
- FIGS. 10A and 10B are detailed graphs illustrating crank angle and behaviors of a piston in a variable compression ratio device according to embodiments of the present disclosure.
- FIG. 11 is a table illustrating time points at which a first sensor element is sensed in a variable compression ratio device according to embodiments of the present disclosure.
- FIG. 12 is a flow chart illustrating a method for controlling a variable compression ratio device according to embodiments of the present disclosure.
- vehicle or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g., fuels derived from resources other than petroleum).
- a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.
- controller may refer to a hardware device that includes a memory and a processor.
- the memory is configured to store program instructions, and the processor is specifically programmed to execute the program instructions to perform one or more processes which are described further below.
- the below methods may be executed by an apparatus comprising the controller in conjunction with one or more other components, as would be appreciated by a person of ordinary skill in the art.
- FIG. 1 is a block diagram schematically illustrating a configuration of a variable compression ratio device according to embodiments of the present disclosure.
- variable compression ratio device includes a compression ratio controller 199 , a hydraulic controller 200 , a position sensor 100 , and a crank angle sensor 110 , and the hydraulic controller 200 includes an oil pump 135 , a spool valve 109 , and an oil control valve 120 .
- the position sensor 100 senses a position of a piston 500 (see FIG. 4 ) provided in a cylinder of an engine, and the crank angle sensor 110 senses a rotation position of a crank shaft 500 (see FIG. 4 ), and the sensed signal is transmitted to the compression ratio controller 199 .
- the position sensor 100 includes a first sensor element 452 and a second sensor element 450 as illustrated in FIG. 5
- the crank angle sensor 110 may refer to a known art.
- the compression ratio controller 199 may vary a compression ratio of the engine by varying a position of the piston 500 by controlling the oil control valve 120 according to a signal sensed by the sensor and operating conditions (e.g., RPM, an injection amount of fuel, etc.).
- FIG. 2 is a graph illustrating a relation between compression ratio and heat efficiency according to embodiments of the present disclosure.
- the horizontal axis represents compression ratios of a combustion chamber at a top dead center of the piston, and the vertical axis represents heat efficiency. As a compression ratio is high, heat efficiency tends to be increased.
- a compression ratio may be reduced in a high-load region to reduce knocking and increased in a low-load region to enhance heat efficiency.
- FIG. 3 is a graph illustrating relation among compression ratio, a revolution per minute (RPM) of an engine, and engine torque according to embodiments of the present disclosure.
- RPM revolution per minute
- the horizontal axis represents RPM and the vertical axis represents output torque of the engine, and engine torque according to a high compression ratio and a low compression ratio is illustrated.
- the compression ratio relates to engine torque.
- FIG. 4 is a view schematically illustrating a flow of hydraulic fluid in a variable compression ratio device according to embodiments of the present disclosure.
- the variable compression ratio device includes an oil pump 135 , a check valve 517 , an oil control valve 120 , an actuator 512 , a compression ratio controller 199 , a first control line 521 , a second control line 522 , a crank shaft 505 , a spool valve 109 , a connecting rod 145 , a first chamber connection passage 210 a , a second chamber connection passage 212 qa , a piston pin 105 , a piston 500 , and an eccentric cam 115 .
- the oil pump 135 pumps oil present in an oil tank, and the check valve 517 prevents pumped oil from flowing backwards to the oil pump 135 .
- the oil control valve 120 is operated by the actuator 512 , and the actuator 512 is controlled by the compression ratio controller 199 .
- the oil control valve 120 may transmit a hydraulic fluid transmitted from the oil pump 135 to the spool valve 109 through the first control line 521 or may transmit the hydraulic fluid to the spool valve 109 through the second control line 522 according to operation modes.
- a first chamber connection passage 210 a connecting one side of the spool valve 109 and the first chamber ( 155 of FIG. 5 ) and a second chamber connection passage 212 a connecting the other side of the spool valve 109 and the second chamber ( 157 of FIG. 5 ) are formed.
- the spool valve 109 controls each of the hydraulic fluids passing through the first chamber connection passage 210 a and the second chamber connection passage 212 a to control a rotation position of the eccentric cam 115 .
- a vertical position of the piston 500 is varied with respect to the piston pin 105 according to a rotation position of the eccentric cam 115 .
- the spool valve 109 may perform a function of a generally known crank pin (not shown).
- the spool valve 109 may be disposed as a separate component, rather than replacing the crank pin.
- Detailed structures of the spool valve 109 , the oil pump 135 , the actuator 512 , and the like, may refer to a known art.
- FIG. 5 is a partial cross-sectional view illustrating a variable compression ratio device according to embodiments of the present disclosure.
- an upper end portion of the connecting rod 145 is inserted into a recess formed in a lower portion of the piston 500 and the piston pin 105 penetrates through the piston 500 and an upper end portion of the connecting rod 145 to connect the piston 500 and the connecting rod 145 .
- the eccentric cam 115 is formed between an inner circumferential surface of the connecting rod 145 and an outer circumferential surface of the piston pin 105 .
- a rotation center of the eccentric cam 115 and a rotation center of the piston pin 105 are eccentric from each other, and the piston 500 may move up and down according to a rotation position of the eccentric cam 115 .
- a recess 502 is formed on an outer surface of the eccentric cam 115 , a protrusion 150 is formed on one side of an inner circumferential surface of the connecting rod 145 to divide the recess 502 into a first chamber 155 and a second chamber 157 , and a sealing member 152 sealing the first chamber 155 and the second chamber 157 is installed at a front end portion of the protrusion 150 .
- the oil control valve 120 may not supply a hydraulic fluid to the first control line 521 and the second control line 522 .
- a first sensor element 452 is provided at a lower end of the piston 500 and a second sensor element 450 is fixed to and mounted on one side of a cylinder of the engine.
- the second sensor element 450 is disposed in a movement route of the first sensor element 452 .
- the first sensor element 452 may be formed of a magnetic material with magnetism, and the second sensor element 450 may be formed as an element sensing magnetism.
- FIG. 6 is a view schematically illustrating behaviors of a piston according to compression ratios in a variable compression ratio device according to embodiments of the present disclosure.
- the first sensor element 452 ascends in height together with the piston 500
- a middle compression ratio is implemented by the height of the piston 500
- the height of the first sensor element 452 is adjusted to a middle position together with the piston 500 .
- FIG. 7 is a graph illustrating behaviors of a piston and crank angle according to compression ratios in a variable compression ratio device according to embodiments of the present disclosure.
- the horizontal axis represents crank angles indicating rotation positions of the crank shaft 505
- the vertical axis represents positions of the piston 500 , specifically, positions of the first sensor element 452 disposed in the piston 500 .
- a point at which the second sensor element 450 senses the first sensor element 452 is about 86.8°.
- a point at which the second sensor element 450 senses the first sensor element 452 is about 90°, and with respect to the maximum compression ratio, a point at which the second sensor element 450 senses the first sensor element 452 is about 93.2°.
- FIG. 8 is a table illustrating crank angles at which a first sensor element is sensed according to compression ratios of FIG. 7 .
- compression ratios are implemented according to positions of the piston 500 , and a maximum compression ratio is 13 and a minimum compression ratio is 8.
- a maximum compression ratio is 13
- a minimum compression ratio is 8.
- a crank angle at which the second sensor element 450 senses the first sensor element 452 is about 93.2°, and with respect to the minimum compression ratio, a crank angle at which the second sensor element 450 senses the first sensor element 452 is about 86.8°.
- a point at which the second sensor element 450 senses the first sensor element 452 is about 90°.
- the fact that the point at which the second sensor element 450 senses the first sensor element 452 is changed on the basis of crank angles according to compression ratios may refer to the contents of FIGS. 6 and 7 .
- FIG. 9 is a graph illustrating behaviors of a piston and torque applied to an eccentric camp according to crank angles in a variable compression ratio device according to embodiments of the present disclosure.
- the horizontal axis represents crank angles and the vertical axis represents behaviors of the piston 500 and torque applied to the eccentric cam 115 .
- the piston 500 repeatedly moves between a top dead center (TDC) and a bottom dead center (BDC) according to an intake operation, an exhaust operation, a compression operation, and an expansion operation of the combustion chamber.
- TDC top dead center
- BDC bottom dead center
- the piston 500 forms torque in a counterclockwise direction in the eccentric cam 115
- the piston 500 forms torque in a clockwise direction in the eccentric cam 115
- the piston 500 forms torque in a counterclockwise direction in the eccentric cam 115 .
- the first region corresponds to the compression and expansion operation to correspond to a TDC
- the second region corresponds to the expansion and exhaust operation to correspond to a BDC
- the third region corresponds to the exhaust and expansion operation to correspond to a next TDC.
- a region in which relative small torque is formed in the eccentric cam 115 corresponds to a region in which the piston 500 is positioned in the BDC portion.
- FIGS. 10A and 10B are detailed graphs illustrating crank angle and behaviors of a piston in a variable compression ratio device according to embodiments of the present disclosure.
- the horizontal axis represents crank angles indicating rotation positions of the crank shaft 505
- the vertical axis represents positions of the piston 500 , specifically, positions of the first sensor element 452 disposed in the piston 500 .
- FIG. 10B the lower drawing illustrates an enlarged view of the portion ‘d’ of FIG. 10A , in which, on the basis of the maximum compression ratio, a BDC position is set to 0 and the second sensor element 450 is positioned in a point 1 mm higher than the reference position.
- the second sensor element 450 is installed at a point 1 mm higher than the BDC, but the height may be modified according to design specifications. However, referring to FIG. 9 , preferably, it is a height corresponding to a region in which torque applied to the eccentric cam 115 is 0.
- points where the second sensor element 450 senses the first sensor element 452 are about 141° (180 ⁇ 39) in a descending region and 216° (180+36) in an ascending region.
- FIG. 11 is a table illustrating time points at which a first sensor element is sensed in a variable compression ratio device according to embodiments of the present disclosure.
- a reference position is 180° as a crank angle, and with respect to the maximum compression ratio, a sensing position at the time of descending is 163° and a sensing position at the time of ascending is 195°. Accordingly, a duration value, a difference value therebetween, is 32°.
- a sensing position at the time of descending is 142° and a sensing position at the time of ascending is 217°. Accordingly, a duration value, a difference value (217-14) therebetween is 75°.
- a current compression ratio may be indirectly calculated.
- a current compression ratio may be calculated using the duration value, a target compression ratio according to operating conditions may be calculated, and a compression ratio may be varied such that the current compression ratio may reach the target compression ratio.
- FIG. 12 is a flow chart illustrating a method for controlling a variable compression ratio device according to embodiments of the present disclosure.
- controlling starts and operating conditions are input in operation S 120 .
- the operating conditions of the engine may include an injection amount of fuel, a load, an RPM of the engine, and the like.
- a target compression ratio is selected or calculated from the input operating conditions, and in operation S 124 , a current compression ratio is selected or calculated using the information described above with reference to FIGS. 7 to 11 .
- operation S 126 when a value obtained by subtracting the target compression ratio (i.e., target value) from the current compression ratio (i.e., current value) is greater than a preset value, operation S 130 is performed, or otherwise, operation S 128 is performed.
- the current compression ratio is reduced by supplying a hydraulic fluid to the second chamber 157 .
- operation S 128 when the value obtained by subtracting the target compression ratio (i.e., target value) from the current compression ratio (i.e., current value) is smaller than the set value, operation S 132 is performed, or otherwise, operation S 134 is performed.
- the current compression ratio is increased by supplying the hydraulic fluid to the first chamber 155 .
- the current compression ratio is maintained by blocking the hydraulic fluid transmitted to the first chamber 155 and the second chamber 157 .
- the current compression ratio when an absolute value of a difference value between the current compression ratio and the target compression ratio does not deviate from the set value, the current compression ratio may be maintained as is, and when the absolute value of the difference value deviates from the set value, the current compression ratio may be controlled to be changed to be close to the target compression ratio.
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Abstract
Description
100: position sensor | 105: piston pin |
109: spool valve | 110: crank angle sensor |
115: eccentric cam | 120: oil control valve |
135: oil pump | 145: connecting rod |
150: protrusion | 152: sealing member |
155: first chamber | 157: second chamber |
199: compress ratio controller | 200: |
210a: first |
|
212a: second chamber connection passage | |
452: first sensor element | 450: second sensor element |
500: piston | 502: recess |
505: crank shaft | 512: actuator |
517: check valve | 521: first control line |
522: second control line | |
Claims (17)
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KR1020170103408A KR20190018822A (en) | 2017-08-16 | 2017-08-16 | Variable compression ratio device, and the control method thereof |
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US20190055885A1 US20190055885A1 (en) | 2019-02-21 |
US10260410B2 true US10260410B2 (en) | 2019-04-16 |
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US (1) | US10260410B2 (en) |
KR (1) | KR20190018822A (en) |
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KR101896335B1 (en) * | 2016-11-23 | 2018-09-07 | 현대자동차 주식회사 | Variable compression ratio device |
US11092089B1 (en) * | 2020-06-30 | 2021-08-17 | GM Global Technology Operations LLC | Variable compression ratio engine control strategy |
CN114076039B (en) * | 2020-08-14 | 2023-11-14 | 上海汽车集团股份有限公司 | Compression ratio control method and system for automobile engine |
CN114109622A (en) * | 2020-08-25 | 2022-03-01 | 长城汽车股份有限公司 | Method and device for controlling engine compression ratio and vehicle |
CN113700565B (en) * | 2021-07-28 | 2022-11-08 | 东风汽车集团股份有限公司 | Control method and device of variable compression ratio engine and engine control system |
WO2023084997A1 (en) * | 2021-11-10 | 2023-05-19 | 株式会社神戸製鋼所 | Crankshaft phase measuring device, crankshaft phase measuring method, internal combustion engine control method, crankshaft, and internal combustion engine |
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- 2017-12-04 DE DE102017221814.2A patent/DE102017221814B4/en not_active Expired - Fee Related
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Also Published As
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KR20190018822A (en) | 2019-02-26 |
US20190055885A1 (en) | 2019-02-21 |
CN109404142A (en) | 2019-03-01 |
DE102017221814B4 (en) | 2022-03-24 |
DE102017221814A1 (en) | 2019-02-21 |
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